WSU Clark County Extension

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Powis Castle Wormwood

Scientific name: Artemesia arborascens 'Powis Castle'

Type:Evergreen shrubs
Plant Requirements
Zone:6 to 9
Sun:Full to partial sun
Plant Characteristics
Height:3 ft
Width:6 ft
Bloom:Summer flowers
Bloom Time:July to August
Bloom Color:Yellow
Additional Characteristics



Wildlife value

Description The Wormwood cultivar known as ‘Powis Castle’ is sold at the garden centers for its beautiful silvery-gray evergreen foliage. It can be a welcome addition to mixed shrub and perennial borders. It is often used in craft displays in either fresh or dried flower arrangements.

This evergreen shrub grows to 3’ tall and 5’-6’ wide over time. It features silvery foliage that's soft to the touch and fragrant. The soft foliage makes it a great filler in an herbaceous garden that would otherwise lack structure during the winter.

Small yellow flowers form in mid-summer extending into September. The flowers don’t add all that much however to the appeal of this shrub.

Powis Castle Wormwood grows in average, well-drained soil in full sun. Plants should be trimmed back before flowers fully develop in summer to a nice, mound form. Once established it won’t need supplemental summer irrigation. It will tolerate high temperatures and humid conditions.

Older plants need serious trimming in order to re-build their mounding habit.

None reported.
For assistance, contact Dr. Charles Brun (, (360) 397-6060 5701
Computing and Web Resources, PO Box 6234, Washington State University, Pullman WA 99164-6234